Masteries

Offense:
21

Defense:
9

Utility:
0

Threats to Yasuo with this build

You can use your windwall to block ziggs bombs and then go in for the engage, he has no change.

3

Karthus

Being able to dodge mostly of Karhus Q with Yasuo's E make it easy for you to win 1v1, becuase Kathus main source of damage is his Q (and E R)

5

Katarina

You will go even against a Katarina. You can block her Q and R with Wind Wall easily, but she has shorter cooldown on them than you have on WInd Wall (20 sec ish) so you have a fair fight coming up against her.

8

Zed

You might think that you can block his Q with Wind Wall, adn you can, but he has a very short colldown on it, there is also no escape from his W E R.

8

Kayle

Kayle ignores Yasuo's Wind Wall with mostly of her abilites. And can use her ultimate when Yasuo use's his by taking 0 damage.

Yasuo can critical strike an opponent with Steel Tempest, and thats why you should have a critical damage quint, and some armor is good if you want to be able to go all in when the teamfight starts. Magic resist is exceptional to have if you face, lets say, Leblanc. And of course attack damage is crucial in terms of killing your target(s) in a smoother fashion.